Dioxygen directly reacts with nearly all metals and non-metals except some metals (e.g., Au, Pt) and some noble gases and form oxide(s). Oxides can be simple (e.g., MgO, Al2O3) or mixed (Pb3O4, Fe3O4)

Question

Dioxygen directly reacts with nearly all metals and non-metals except some 
metals (e.g., Au, Pt) and some noble gases and form oxide(s). Oxides can be 
simple (e.g., MgO, Al2O3) or mixed (Pb3O4, Fe3O4). Simple oxides can be 
classified on the basis of their acidic, basic or amphoteric character. An oxide
that combines with water to give an acid is termed acidic oxide (e.g., SO2, 
Cl2O7, CO2, N2O5). For example, SO2 combines with water to give H2SO3, an acid.
Gaseous non-metal (A) --O2 / approp. temp.--> P↑ --O2 / room temp.--> Q↑ 
--H2O--> R (oxy acid) + P↑
Solid non-metal (B) --O2 / approp. temp.--> X↑ --O2 / approp. catalyst & 
temp.--> Y↑ --H2O--> Z (oxy acid) + Heat

Prashant Kotian · Accepted Answer

Correct answer: C. S8(B) --O2--> SO2↑(X) --O2--> SO3↑(Y) --H2O--> H2SO4(Z) + Heat. SO2(X) + Ba(OH)2 -> BaSO3↓(White turbidity) --SO2+H2O--> Ba(HSO3)2(Clear solution).

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